:root{--ink:#1c2b24;--paper:#f2f5f7;--panel:#f7fafc;--line:#cedbe3;--accent:#3d6b52;--accent-soft:#e4ede8;--mono:'SFMono-Regular',Consolas,'Liberation Mono',Menlo,monospace}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--paper);color:var(--ink);min-height:100vh}
header h1{margin:0 0 4px;font-size:26px;font-weight:700}
.entry-header {margin-bottom: 2em;}
.layout{display:grid;grid-template-columns:340px 1fr;gap:24px;align-items:start}
@media (max-width:860px){.layout{grid-template-columns:1fr}}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:20px}
.panel+.panel{margin-top:16px}
.field{margin-bottom:16px}
.field:last-child{margin-bottom:0}
.field label{display:flex;justify-content:space-between;align-items:center;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:#42524a;margin-bottom:6px}
.field label span.val{font-family:var(--mono);font-weight:500;color:var(--accent);text-transform:none;letter-spacing:0;font-size:12px}
input[type=number],select{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:6px;font-size:14px;background:#fff;color:var(--ink)}
input[type=range]{width:100%;accent-color:var(--accent)}
input[type=color]{width:100%;height:36px;border:1px solid var(--line);border-radius:6px;padding:3px;background:#fff}
.margin-grid,.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.margin-grid .mini-label{font-size:11px;color:#5b6b62;margin-bottom:4px;display:block}
.section-title{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--accent);margin:0 0 14px}
.checkbox-row{display:flex;align-items:center;gap:8px;font-size:13px}
.checkbox-row input{accent-color:var(--accent);width:16px;height:16px}
.orientation-toggle{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.orientation-toggle button{padding:10px 8px;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:7px;font-size:13px;font-weight:600;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:4px}
.orientation-toggle button .hexicon{font-size:20px;line-height:1}
.orientation-toggle button.active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}
.segmented{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.segmented button{padding:8px;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:7px;font-size:12.5px;font-weight:600;cursor:pointer;line-height:1.3}
.segmented button.active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}
.hint{margin:8px 0 0!important;font-size:11.5px;color:#8a978f;line-height:1.4}
.preview-wrap{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:20px;display:flex;flex-direction:column;gap:14px;min-height:70vh}
.preview-toolbar{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:10px}
.preview-toolbar .dims{font-family:var(--mono);font-size:12px;color:#5b6b62}
.preview-toolbar .dims small{display:block;font-family:inherit;color:#8a978f;margin-top:3px;font-size:11px}
.export-buttons{display:flex;gap:8px}
button{font-family:inherit;font-size:13px;font-weight:600;padding:9px 16px;border-radius:7px;border:1px solid var(--accent);background:var(--accent);color:#fff;cursor:pointer;transition:transform .05s ease,opacity .15s ease}
button.secondary{background:#fff;color:var(--accent)}
button:hover{opacity:.9}
button:active{transform:scale(0.97)}
.canvas-stage{flex:1;overflow:auto;display:flex;align-items:flex-start;justify-content:center;background:linear-gradient(45deg,#e0e2e4 25%,transparent 25%),linear-gradient(-45deg,#e0e2e4 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#e0e2e4 75%),linear-gradient(-45deg,transparent 75%,#e0e2e4 75%);background-size:16px 16px;background-position:0 0,0 8px,8px -8px,-8px 0;border-radius:8px;padding:20px}
#gridCanvas{box-shadow:0 2px 14px rgba(0,0,0,.12);background:#fff;max-width:100%;height:auto}